Twin-mill-controlling device



' J."C. KELLER. TWIN MILL CONTROLLING DEVICE.

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Patented Feb. 15, 1921.

J. C. KELLER.

TWIN MILL CONTROLLING DEVICE.

APPILICATION FILED FEB. 2O, 19!].

INVENTOR Jamo'u 611 /13 1:

ATTORNEY Eli? JAMES C. KELLER, OF BUTLER, TENNESSEE, ASSIGNOR 0F ONE-THIRD TO JOHN E. REEGE AND ONE-THIRD TO WILSON L. REE-GE, BOTH OF BUTLER, TENNESSEE.

TWIN-MILL-COlYlTROLLING- DEVICE.

Application filed February 20, I917.

- 1 0 all 10 from it may concern Be it known that I, JAMns C. KELLER, a citizen of the United States, residing at Butler, in the county of Johnson and State of Tennessee, have invented new and useful Improvements in Twin- Mill Controlling Devices, of which the following is a specification.

This invention relates to controlling devices especially adapted to be used in conjunction with twin mills .and it consists in the novel features hereinafter described and claimed.

The present invention is an improvement over the structure shown in earlier United States Patents, Nos. 1,189,122, and 1,206,716.

The object of the present invention is to provide a simple and substantial controlling device for a twin mill the parts being so ar ranged as to permit of both mills operating simultaneously or permitting one mill to operate. while the other is not in operation. A further object of the invention is to provide means for positively and securely holding the parts at adjusted positions, in order to prevent any accidental movement of the runner stone of the mill with relation to the bed stones thereof during the operation of the mill.

In the accompanying drawing Figure -1 is a side elevation of a twin mill with the controlling device applied;

Fig. 2 is a top plan view of the same with parts in section; r

Fig. 3 is a transverse sectional view of the controlling device cut on the line' 33 of Fig. 2;.

Fig. 4 is a longitudinal sectional view of the intermediate portionof-the controllin device; i

Fig. 5 is a vertical sectional view of the same cut on the line 55 of Fig. 3;

Fig. 6 is a side elevation of a lever used in the controlling device with parts illus-. trated insertion; V c

Fig. 7 is a detailed sectional view of the lever cut 011 the line 77 of Fig. 6.

As illustrated in the accompanying drawings the twin mill comprises units A and B which are mounted upon a suitable base 1 whereby the said units are held in fixed position with relation to each other. Each unit includes a bed stone 2 and a runner stone 3. The runner stones 3 are mounted Specification of Letters Patent.

Patented Feb. 15, 1921.

Serial no. 149,821.

upon the outer ends of alined shaft sections 4. A frame 5 is interposed beween the units A and B and supports the inner portions of the shaft sections 4. The inner ends of the shaft sections 4: are received in a sleeve 6, the said shaft sections being splined in the said sleeve whereby they are constrained to rotate in unison with the same but they mav move longitudinally with relation to thb same. A belt pulley 7 is mounted upon the sleeve 6 and a belt may be applied to the said pulley in a usual manner. The sleeve 6 is restrained against longitudinal movcment with relation to the frame 5 by means of collars 8 which are fixed to the said sleeve and which bear against the edges of the adjacent bearings which receive the shaft sections 4.

Collars 9 are mounted upon the said shaft sections 4 and the said collars are arranged in pairs or sets, one set being located upon each of the said shaft sections. Bands 10 are located between the members of each set of collars 9 and the said bands are provided v with studs 11. Levers 12 are pivoted upon the frame 5 and extend transversely across the same and the shaft-sections i. The-said levers are provided at points between their ends with openings which receive the col lars 9 and apertures whlch snugly receive the studs 11. r

Ratchet segments 18 are mounted at the 111116! surfaces of the outer or free end nortionsof the levers 12 and the said segments are provided at their inner sides with cam surfaces 14:. Rods 15 pass transversely through the mill units and B and also pass through the free end portions ,of the levers 1.2 and the segments 13 carried there- I by. Springs 16 surround the r ods '15 and are interposed between the mill units A and B and the adjacent sides of the levers 12 and are under tension with a tendency to hold the free ends of the saidlevers 12 away from v the said mill units. Hand-levers 17 are pivhand levers 17 and is provided with a lower end adapted to move along the curved por-.

'tion 20 of the adjacent pawl 18. The upperders 22 which lie in the paths of movement of the said hand levers and are adapted to limit the swinging movement thereof with relation to the said segment.

When it is desired to move one or both of the runner stones 3 toward itscooperating bed stone 2 the upper end of the lever 1 which is connected with that mill unit in which the runner stone is located is swung in an outward direction whereby the said hand. lever is moved along the cam surface 13 of the adjacent segment 14:. Thus the adj acent lever 12 is swung against the tension of the spring 16 which bears against the same and that shaft section 4 which is connected with the said lever is moved longitudinally whereby the attached runner stone 3 is moved toward its cooperating bed stone 2.. When the said runner stone 3 has been properly adjusted the angularly disposed end 19 of the pawl 18 connected with the said hand lever engages in the teeth of the adjacent ratchet segment and the said lever and the shaft section and runner stone are held at the adjusted positions. When it is desired to move the runner stone away from the adjacent bed stone the bar 21 in the hand lever is swung along the curved portion 20 of the pawl 18 to a position as indicated in dotted lines in Fig.6 of the drawing where- I by the said'pawl 18 is swung and the angularly disposed end 19 is lifted above the teeth of the segment 13. Thus the hand lever 17 is free to be swung in an inward direction and as the said lever moves along the cam surface 14 of the adjacent segment 13 the tension of the adjacent spring 16 comes into play and the free end portion of the lever 12 is moved away from the adjacent mill unit and hence the runner stone is moved away said mill unit.

In view of the fact that the shaft sections 4.- may be'moved independentlyof each other with relation to the sleeve 6' the runner stones of the respective mill units may be mm the bed stone ofthe adjusted independently of each other, or by swinging both of the hand levers 17 approximately at the same timev the runner stones of both mill units may be adjusted substantially at the same time.

-- From the foregoing description taken in device for a mill is provided which is posi- 7 tive in its action and of simple structural arrangement and which will securely hold the runner stones at adjusted positions with relation to the bed stones of themill units. Furthermore the parts of the controlling device are so arranged as to render it practically impossible for the runner stones to become displaced with relation to the bed stones during the operation of the units of the mill. 7

If desired the feeding devices of the respective mill units may be operatively connected with the shaft sections 4 and hence the said feeding devices may be operated from the shaft sections which rotate the runner stones in the units,

Having described the invention what is claimed is V The combination in a mill,-of a unit, a rotatable and endwise movable shaft section entering the same, a runner stone carried by said shaft section, collars fixed on the shaft section and having opposed reduced portions, at band loosely surrounding said reduced collar portionsand snugly fitting the same and having a stud, a lever fulcrumed at one end and having an aperture at an intermediate point in its length receiving said stud, a rod connected with the unit and passed loosely through the lever at approxi mate right angles thereto, a spring mounted on said rod and interposed between the unit and the adjacent side of said lever, a hand lever fulcrumed on said'rod at the opposite ders opposed to, the lever and adaptedto limit the movement thereof in opposite directions.

In testimony whereof I aflix my signature.

- JA ES c. KELLER. 

